“ L1 wizard spell
This spell must be cast for 31 consecutive days by one wizard to create a +1 sword,-2 to anyone else holding it(other than sword owner).No special ingredients or quality of blade, the only requirement on this part is it must be a short sword or longer and must be a true sword. The sword must draw blood from a living creature of at least 1-1 hit die every day and The blade is -1 until the 31st casting, when it becomes fully and permanently enchanted .Variants that enchant other weapons could be possible.”
“ Have a large room that elevates either up or down when triggering a trap. The floor can bring the players to new levels, where a mighty beast roams, or the floor flattens the players into the ceiling or drop into a pit of lava.”
“ On a location with numerous webs, and at least one big spider, there is a something inside a cocoon. It is humanoid in shape, still moving. If the heroes free it (not before they kill or drive away the spiders), they meet a ... zombie!
The poor zombie wandered the dungeon alone, and tried to kill a big living creature (= a spider). The spider used the usual treatment, even if this victim did not look tasty. The zombie can be easily killed as any other zombie. It got but several doses of spider-poison, so can be something worth if it is extracted. You can mention to a druid or ranger the fact the spider had no poison anymore.”